CVE-2023-28769
published 2023-04-27CVE-2023-28769: The buffer overflow vulnerability in the library “libclinkc.so” of the web server “zhttpd” in Zyxel DX5401-B0 firmware versions prior to V5.17(ABYO.1)C0 could…
PriorityP182critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
ITWEXPLOITVulnCheck KEV
Exploited in the wild
EPSS
5.42%
91.8th percentile
The buffer overflow vulnerability in the library “libclinkc.so” of the web server “zhttpd” in Zyxel DX5401-B0 firmware versions prior to V5.17(ABYO.1)C0 could allow a remote unauthenticated attacker to execute some OS commands or to cause denial-of-service (DoS) conditions on a vulnerable device.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| zyxel | dx5401-b0_firmware | < V5.17(ABYO.1)C0 | V5.17(ABYO.1)C0 |
| zyxel | dx5401-b0_firmware | < 5.17\(abyo.1\)c0 | 5.17\(abyo.1\)c0 |
Detection & IOCsextracted from sources · hover to see the quote
- →Target the zhttpd web server process for anomalous activity; exploitation requires the zhttp webserver to be network-reachable and requires no authentication ↗
- →Monitor for unexpected OS command execution or child processes spawned from zhttpd, particularly processes running as root following exploitation ↗
- →Alert on outbound binary download attempts (e.g., wget/curl/tftp) initiated by zhttpd or its child processes, as post-exploitation payload staging is a documented attacker technique ↗
- ·Vulnerability affects more than 40 Zyxel routers and CPE devices, not just the DX5401-B0; scope of affected hardware is broad ↗
- ·Patched in Zyxel DX5401-B0 firmware V5.17(ABYO.1)C0; devices running prior versions remain vulnerable ↗
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vulncheck9.8CRITICAL
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GHSA
GHSA-xg39-26cw-gxj9: The buffer overflow vulnerability in the library “libclinkc
ghsa_unreviewed·2023-07-06
CVE-2023-28769 [CRITICAL] CWE-120 GHSA-xg39-26cw-gxj9: The buffer overflow vulnerability in the library “libclinkc
The buffer overflow vulnerability in the library “libclinkc.so” of the web server “zhttpd” in Zyxel DX5401-B0 firmware versions prior to V5.17(ABYO.1)C0 could allow a remote unauthenticated attacker to execute some OS commands or to cause denial-of-service (DoS) conditions on a vulnerable device.
VulnCheck
Zyxel dx5401-b0_firmware Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
vulncheck·2023·CVSS 9.8
CVE-2023-28769 [CRITICAL] Zyxel dx5401-b0_firmware Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Zyxel dx5401-b0_firmware Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
The buffer overflow vulnerability in the library “libclinkc.so” of the web server “zhttpd” in Zyxel DX5401-B0 firmware versions prior to V5.17(ABYO.1)C0 could allow a remote unauthenticated attacker to execute some OS commands or to cause denial-of-service (DoS) conditions on a vulnerable device.
Affected: Zyxel dx5401-b0_firmware
Required Action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Exploitation References: https://levelblue.com/blogs/labs-research/ngioweb-remains-active-7-years-later
No detection rules found.
No writeups or analysis indexed.
2023-04-27
Published
Exploited in the wild